<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" placeholder="员工姓名" id="i1">
<input type="text" placeholder="工资" id="i2">
<input type="text" placeholder="工作" id="i3">
<input type="button" value="添加" onclick="f()">
<table border="1">
    <caption>员工列表</caption>
    <tr>
      <th>姓名</th>
      <th>工资</th>
      <th>工作</th>
    </tr>
</table>
<script>
  function f(){
    //创建tr和3个td
    let tr=document.createElement("tr");
    let nameTd=document.createElement("td");
    let salTd=document.createElement("td");
    let jobTb=document.createElement("td");
    //给td设置显示文本
    nameTd.innerText=i1.value;
    salTd.innerText=i2.value;
    jobTb.innerText=i3.value;
    //把td装进tr
    tr.append(nameTd,salTd,jobTb);
    //把tr装进table
    let table=document.querySelector("table");
    table.append(tr);
  }
</script>
</body>
</html>